bonwill



(No Model.) 2 Sheets-Sheet 1.

W. G. A. BONWIL'L.

DENTAL PLUGGER. No. 377,934. Patented'f'eb. 14,1888.

IWITN ESSES (No ModeL) 2 Sheets-Sheet 2. I W. G. A. BONWILL.

, DENTAL PLUGGERI. 77.984. Patented Feb. 14,1888.

WITNESSES:

' N. PETERS. Pho (o-Li\bcgnprher. Washington. D. c.

UNITED STATES PATENT OFFICE.

WILLIAM G. A. BONWILL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE S. S. WHITE DENTAL MANUFACTURING COMPANY, OF SAME" PLACE.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 377,984, dated February 14, 1888.

Application filed December 16, 1886. Serial No. 221,775. (No model.) I

ments in dental pluggers, the object of which is to improve such devices. The nature and objects of my invention will I more particularly be set forth in the detailed description thereof which will follow, while the subject-matter claimed by me is distinctly recited in the summary at the close of this specification.

The accompanying drawings show my several improvements as embodied in a dental plugger having a revolving hammer, and in said drawings Figure l is a view in elevation of my improved'plugger; Fig.2, asimilarview at right angles to Fig. 1, and with a portion of theinstrument in longitudinal section. Fig. 3 is a view in elevation of a modified form of the instrument, and Fig. 4a similar view with I 0 a part of the device in longitudinal section.

Figs. 5, 6, 7, and 8 are views of the axle or axis pin of the revolving hammer, several different forms thereof being shown. Fig. 9 is a View of the revolving hammer detached, and Figs. 10 and 11; are sectional views of a modified form of the adjusting-connections shown in Figs. 3 and 4, by which the force of the blow delivered upon the tool-carrying spindle may be regulated. A yoke or forked frame, A, straddles the revolving hammer B, which turns upon an axle or axis pin, a, and is driven by a beltpulley, B, so as to revolve rapidly upon its axis or axle pin a. Straddling said revolving hammer from the opposite side is a yoke or forked frame, 0, the ends of which are pinjointed to the ends of the frame A'by means of the axis-pin or axle a, above described, so that the yoke-O is free to vibrate or rock relaor pulley-frame.

tively to the frame or yoke A, this being deshown in Figs. 1, 2, and 4and either mode I include within the terms open-sided yoke The spring-latch C may be jointed or fitted with the spring 0 and adapted at its .opposite end, 0, to close upon the end of the axle a. The frame Chas a tubular portion, 0, internally screw-threaded to receive the inner 'or upper externallythreaded end of the section D of the handpiece casing, whereby said hand-piece casingsect-ion D may be screwed in or out of the frame 0 to any desired degree, and in order to lock it when adj usted-in the said casing() the tubular portion 0 of said frame 0 may have slotted walls and a tapered externally threaded surface to receive a screw-nut, O", whereby said nut may be screwed upupon said tapered surface, and the walls of the tubular portion 0 of the frame 0, will be contracted so as to bind upon the handlesection D and lock the two securely together;

' so as to permit said pin to be carried out of engagement with the locking ribs or projections d of said casing-section D. WVhen the sleeve E is moved upward, so as to disengage the pin e from the locking-ribs d, the handpiece casing-section D may be screwed in or. outrelatively to the casing C, while as soon as the sleeve E is moved to engage said pin 6 with the ribs 01, which is the normal condition, the parts will be locked firmly together. The sleeve E may have slotted walls, so as to give its upper end a spring action, and be fitted with a teat or projection, e, to engage a pit or recess in the tubular portion 0 of the casing C, so as to lock it from accidental movements.

The hand piece casing consists, preferably, of the section D, before described, and a handle-section, F, said section F being fitted upon the front end of the section D and locked thereon with a capability of turning independently by means, for example, of a lugnosed plate, G. (Shown in Figs. 1, 2, 3, and 4.) This hand-piece casing is tubular and the tool-carrying spindle H is fitted to reciprocate or move endwise therein under the impacts of the blows of the revolving hammer B, a projection, b, of which at every revolution of said hammer strikes a blow upon the end of the said tool-carrying spindle to drive it forward. A spring, I, acts to return the end of the tool-carrying spindle H to a position to be struck by the revolving hammer after each blow thereof, in a well-known way, or may be returned by hand, as in Fig. 2.

The amount of endwise movement allowed the tool-carrying spindle in the hand-piece casing may be determined by means of alug or pin, 9, of the plate G,which passes through an openiugin the casing'section D and fits in an annular groove, h, in said tool-carrying spindle.

In order to permit the tool-carrying spindle H to be turned by the fingers in operating, so as to present the tool-point in different relations to the substance operated upon, and without interfering with its reciprocation, I

may form a longitudinal slot, h, (shown bydotted lines in Fig. 4,) in the tool-carrying spindle and engage therewith the point of a set-screw h assin throu h the casin -seca b g tion F, which constitutes, more particularly, the handlesection of the instrument.

I do not claim herein this construction, however, as it forms part of the subject-matter of another application, and in lieu of that organization I preferably employ the organization of the casing and tool-carrying spindle shown in Figs. 1 and 2, in which the handle-section F may turn upon the sectionD in conforming to the movements of the hand in operating the instrument, while fitted to contain a sleeve, J, fastened to the tool-carrying spindle H, this sleeve J constituting virtually a part of the tool-carrying spindle H, and is fitted for operation by the thumb of the operator through a slot, f, in the casing-section F, whereby the tool'carrying spindle may be readily turned independently of the hand-piece casing and also be moved downward or endwise by the operator, so as to carry said spindle forward and its upper hammer end out of the way of the hammer, in order to interrupt the blows of the instrument. This interruption is sometimes necessaryas when picking up gold-foil, for example-in filling cavities of natural teeth,at which time it is desirable in many cases not to stop the motive power, and at the same time have the tool-carrying spindle virtually astationary one, so as to be able readily to take up the gold, for example, or be used in the way of a hand-plugger by direct pressure, instead of by striking blows, as is the case when the spindle is struck by the hammer. When the pressure of the thumb carries the spindle forward out of contact with the revolving hammer and is then released, the spring I (when used) immediately automat-icall y places the instrument in its normal condition, with the butt-end of the tool-carrying spindle in position to be struck by said hammer.

The front end of the tool-carrying spindle H may be socketed or have split or spring jaws and a compression-nut by which to lock the operating-tools in or to the tool-carrying spindle. This tool-locking device is a well-known construction and forms no part of my invention.

I claim as my invention- 1. The combination, substantially as hereinbefore set forth, of a forked frame, an axis-pin extending across said frame from one of its members to the other,a beltpulley of said axispin fitted between said members of said frame, and a joint and fastening for one member of said frame,whereby it may be moved to admit of the insertion of the belt and then be secured to i'nclose the pulley, as described.

2. The combination of the sectional casing adjustable by screw-threads, the inclosed spindle and its striking hammer, and the locking device to maintain the adjustment of said sections, consisting of the locking-ribs of one of said sections and the sliding sleeve and locking-pin of the othersection,which is longitudinally slotted to permit the endwise movement of said sleeve and pin, substantially as described.

In testimony whereofI affix my signature in presence of two witnesses.

WM. G. A. BONWILL.

Witnesses:

ELI L. STARR, J AS. F. LYND. 

